@PX:
Getting lucky with a crunchy rocksmash>usmash (true combo) for 61% comes to mind, but I don't think we'll be outrunning him anytime soon. I can see usmash is general being useful in this matchup, which takes the kill out of it. Warios nair, dair and bite will give Zard a LOT of trouble. And clap combos at early % will get damage up fast. Zard is grounded, and hasn't got great anti-aerial moves, so this is easily a 60-40 Warios favour.
Ivy I don't think is that bad. Not great, but use the typical SSS and have ivy 2nd stock and switch to Zard half way through. Grab release>fair/uair/usmash would be great, but we shouldn't depend on it. Wario won't be grabbed easily.
Again, 60-40. At worst, 65-35.
Nothing special needs to be done with Squirtle. Go about you're business, hydrograb, hp dsmash will do wonders, your jab>his jab. Juggle if you can, don't get hasty with uairs/utilts or you might take a waft to the face. Wario is better than Squirtle, but not by a huge margin.
55-45 Wario imo.
A 60-40 MU. Uphill battle, but not impossible if you play your cards right.
Research is needed for this. Guaranteed attacks from air release, what we can rocksmash counter (definately not his fsmash -_-), best spacing tools, and best stage. I'm going to a friend's place for a meet tomorrow and he seconds a very solid Wario, I'll test them out then.
IIRC, Yoshis Island is one of the worse stages for Wario, and PT doesn't hate it.